Re: [PATCH 16/35] writeback: increase min pause time on concurrent dirtiers

Peter Zijlstra
2010-12-14T20:24:49Z

On Tue, 2010-12-14 at 15:13 -0500, Valdis.Kletnieks@vt.edu wrote:
> So you're not guaranteed that 10*HZ is 10 seconds. 10*USER_HZ, sure.
> But not HZ.

You're confused. 10*HZ jiffies is always 10 seconds. Hertz means
per-second. We take CONFIG_HZ ticks per second, so waiting HZ jiffies
makes us wait 1 second.

USER_HZ is archaic and only used to stabilize user-interfaces that for
some daft reason depended on HZ.